What is the significance of a left ventricular ejection fraction (LVEF) greater than 45%?

A left ventricular ejection fraction (LVEF) greater than 45% is significant because it suggests that the heart is functioning well enough to effectively pump blood, indicating a lower risk of heart-related complications during pregnancy. In pregnant individuals, a normal or significantly preserved LVEF is associated with better hemodynamic stability and less likelihood of developing heart failure or other cardiac issues that could complicate pregnancy and delivery.

A higher LVEF generally reflects an adequate cardiac reserve, meaning the heart can meet the increased demands that come with pregnancy due to physiological changes such as increased blood volume and cardiac output. This is critical information for healthcare providers in assessing a patient’s risk factors and ensuring the safety of both the mother and the fetus throughout the gestation period.

In contrast, a significantly reduced LVEF—below the threshold considered normal—could imply the presence of heart failure or other cardiac dysfunctions, leading to increased risks during pregnancy. Therefore, an LVEF above 45% typically indicates a more favorable cardiac status, helping to guide clinical decision-making.